Correlation of Part Orientation during 3D-Printing and the Mechanical Properties of Stainless-Steel Alloy

Abstract

This thesis explores the relationship between the positioning of components during 3D printing and the resulting mechanical and microstructural characteristics of SS-316L alloy, both in its untreated and heat-treated states. Specifically, the study focuses on additive technology implemented at two distinct locations: the stitching line and the center of the print bed using the FS421M additive metal melting system. The current body of literature on the mechanical properties of SS-316L lacks sufficient research on the linked effects of component placement and heat treatment. To address this gap, the authors conducted a comprehensive investigation, presenting original findings. SS-316L is commonly used in applications requiring exceptional resistance to corrosion and high temperatures, and its reduced carbon content enhances resistance to inter-granular corrosion. For evaluating the mechanical properties uniaxial tensile tests and Vickers Hardness tests were conducted at the authors' university. Statistical analysis encompassed factors such as print direction, heat treatment, stress relieving, ultimate tensile strength, yield strength, and specified values. The fracture surfaces were scrutinized using scanning electron microscopy and digital microscopy. The results demonstrate that mechanical properties were affected by the orientation and placement of the samples on the print bed, even when subjected to identical heat treatments. In conclusion, this research highlights the interrelation between part placement in 3D printing and the resulting mechanical and microstructural properties of SS-316L enabling improved practices in additive manufacturing applications.